Tesla 4DR821B / 4DT821B dashboard cluster LCD (PCF85176). More...

#include <SegLCD_PCF85176_4DR821B.h>

Inheritance diagram for SegLCD_PCF85176_4DR821B:

Public Types
enum	SymbolFlags { SYMBOL_ARROW = 0x10 , SYMBOL_TILDA = 0x80 }

Public Types inherited from SegDriver_PCx85
enum	ModeStatus { MODE_STATUS_BLANK = 0 , MODE_STATUS_ENABLED = 1 }
	Enable/disable display. More...

enum	BlinkFrequency { BLINK_FREQUENCY_OFF = 0 , BLINK_FREQUENCY_1 = 1 , BLINK_FREQUENCY_2 = 2 , BLINK_FREQUENCY_3 = 3 }
	Set blink frequency. More...

enum	BlinkMode { BLINK_MODE_NORMAL = 0 , BLINK_MODE_ALTRAM = 1 }
	Set blink mode. More...

Public Types inherited from SegLCDLib
enum	BacklightMode { BACKLIGHT_DIGITAL , BACKLIGHT_PWM }
	Backlight mode for GPIO control. More...

Public Member Functions
	SegLCD_PCF85176_4DR821B (TwoWire &i2c, uint8_t address=DEFAULT_PCF85176_I2C_ADDRESS, uint8_t subaddress=DEFAULT_SUBADDRESS)

void	init () override
	Logical display sections that can be targeted by higher-level rendering logic.

void	setSymbol (uint8_t symbol, bool state)

void	setCursor (uint8_t row, uint8_t col) override
	Set cursor on exact digit.

size_t	write (uint8_t ch) override

Public Member Functions inherited from SegDriver_PCF85176
	SegDriver_PCF85176 (TwoWire &i2c, uint8_t address=DEFAULT_PCF85176_I2C_ADDRESS, uint8_t subaddress=DEFAULT_SUBADDRESS)
	Constructor for PCF85176 segment driver.

Public Member Functions inherited from SegDriver_PCx85
	SegDriver_PCx85 (TwoWire &i2c, uint8_t address, uint8_t subaddress)
	Constructor for PCx85 segment driver.

void	bankSelect (uint8_t input, uint8_t output)
	Select bank for input and output.

void	blink (BlinkFrequency blink=BLINK_FREQUENCY_OFF, BlinkMode mode=BLINK_MODE_NORMAL)
	Set blink frequency and mode.

void	clear () override
	Clear all visible segments on the display.

void	on () override
	Turn the display on.

void	off () override
	Turn the display off.

void	command (uint8_t command) override
	Send RAW command to controller.

void	flush (uint8_t startAddr, uint8_t length) override
	Flush specific range of buffered changes to the display.

virtual void	flush ()
	Flush all buffered changes to the display.

virtual void	flush (uint8_t startAddr, uint8_t length)
	Flush specific range of buffered changes to the display.

Public Member Functions inherited from SegLCDLib
virtual	~SegLCDLib ()
	Virtual destructor to ensure proper cleanup in derived classes.

void	home ()
	Set cursor to 0, 0 without clear display.

void	initBacklight (int8_t backlightPin, BacklightMode backlightMode=BACKLIGHT_DIGITAL, bool backlightActiveHigh=true)
	Initialize GPIO backlight control.

virtual void	setBacklight (bool state)
	Set backlight state (on/off).

virtual void	setBacklight (int brightness)
	Set backlight brightness (0-255).

void	setAutoFlush (bool enable)
	Enable or disable autoflush mode.

bool	getAutoFlush () const
	Get current autoflush state.

const uint8_t *	getRamBuffer () const
	Get pointer to internal RAM buffer (read-only).

size_t	getRamBufferSize () const
	Get size of internal RAM buffer in bytes.

Private Member Functions
void	_setColon (uint8_t row, uint8_t col, bool state) override
	Virtual method for setting colon.

void	_setDecimal (uint8_t row, uint8_t col, bool state) override
	Virtual method for setting decimal point.

void	_setCol0Symbol (uint8_t ch)

bool	_handleCol0Overlay (uint8_t ch)

Static Private Attributes
static constexpr uint8_t	RAM_SIZE = 5

static constexpr uint8_t	FLAG_COLON_DISPLAYED = 0x01

static constexpr uint8_t	FLAG_COL0_OVERLAY = 0x02

static constexpr uint8_t	ADDR_SYMBOLS = 0x00

static constexpr uint8_t	ADDR_SEGS = 0x01

static constexpr uint8_t	DIGITS = 4

static constexpr uint8_t	DECIMAL_POINT_BIT = 0x01

static constexpr uint8_t	MIDDLE_COLON_BIT = 0x01

static constexpr uint8_t	LEFT_COLON_BIT = 0x20

static constexpr uint8_t	MINUS_BIT = 0x40

static constexpr uint8_t	DECIMAL_MIN_COL = 0

static constexpr uint8_t	DECIMAL_MAX_COL = 2

static constexpr int8_t	DECIMAL_COL_OFFSET = -1

Additional Inherited Members
Protected Member Functions inherited from SegDriver_PCx85
void	_setMode (ModeStatus status, ModeDrive drive=MODE_DRIVE_14, ModeBias bias=MODE_BIAS_13)
	Set the mode of the display.

void	_writeRam (uint8_t data, uint8_t address=0) override
	Low-level method to write a single byte to display RAM.

void	_writeRam (uint8_t *data, size_t length, uint8_t address=0) override
	Low-level method to write a data buffer to display RAM.

Protected Member Functions inherited from SegLCDLib
void	_setFlag (uint8_t mask)
	Set a specific flag bit.

void	_clearFlag (uint8_t mask)
	Clear a specific flag bit.

bool	_isFlagSet (uint8_t mask) const
	Check if a specific flag bit is set.

void	_clearAllFlags ()
	Clear all flags.

bool	_dotWrite (uint8_t ch, int8_t minCol, int8_t maxCol, int8_t ramOffset)
	Write decimal point.

void	_dotClearCur (int8_t minCol, int8_t maxCol)
	Clear current decimal (overwrite).

void	_colonClearIfNotFlagged (uint8_t ch, uint8_t colonCol, uint8_t colonFlag)
	Clear colon if its flag is not set.

void	_allocateBuffer (size_t size)
	Allocate RAM buffer for display data.

void	_writeRamMasked (uint8_t data, uint8_t address, uint8_t mask=0xFF)
	Write to display RAM with nibble-aware masking support.

uint8_t	_get_char_value (char ch)
	Helper method to convert a character to its segment representation.

uint16_t	_get_16char_value (char ch)
	Helper method to convert a character to its 16-segment representation.

Protected Attributes inherited from SegLCDLib
bool	_autoFlush = true
	Autoflush mode enabled flag (default: true for LCD API 1.0 compatibility).

int8_t	_backlightPin = -1
	Backlight GPIO pin (-1 if disabled)

BacklightMode	_backlightMode = BACKLIGHT_DIGITAL
	Backlight mode (DIGITAL or PWM)

bool	_backlightActiveHigh = true
	Backlight active high flag.

uint8_t	_backlightBrightness = 0
	Cached backlight brightness.

uint8_t	_displayFlags = 0
	LEDC channel for old ESP32 Arduino Core (2.0.x)

uint8_t *	_ramBuffer = nullptr
	Dynamic RAM buffer for display data (allocated by derived classes).

size_t	_ramBufferSize = 0
	Size of allocated RAM buffer in bytes.

uint8_t	_cursorRow = 0
	Current Row.

uint8_t	_cursorCol = 0
	Current Column.

Static Protected Attributes inherited from SegDriver_PCx85
static constexpr uint8_t	DEFAULT_PCF85176_I2C_ADDRESS = 0x38

static constexpr uint8_t	DEFAULT_SUBADDRESS = 0x00

Static Protected Attributes inherited from SegLCDLib
static constexpr uint8_t	FLAG_PENDING_DOT = 0x80
	Common flag for decimal handling when RAM offset is 0.

Detailed Description

Tesla 4DR821B / 4DT821B dashboard cluster LCD (PCF85176).

Custom segment layout with dashboard indicators and status symbols. I2C interface (SA0 pin sets address, A0-A2 are subaddresses).

See also: examples/PCF85176/4DR821B/4DR821B.ino

Member Enumeration Documentation

◆ SymbolFlags

enum SegLCD_PCF85176_4DR821B::SymbolFlags

Enumerator
SYMBOL_ARROW
SYMBOL_TILDA

Constructor & Destructor Documentation

◆ SegLCD_PCF85176_4DR821B()

SegLCD_PCF85176_4DR821B::SegLCD_PCF85176_4DR821B	(	TwoWire &	i2c,
		uint8_t	address = `DEFAULT_PCF85176_I2C_ADDRESS`,
		uint8_t	subaddress = `DEFAULT_SUBADDRESS`
	)

Member Function Documentation

◆ _handleCol0Overlay()

bool SegLCD_PCF85176_4DR821B::_handleCol0Overlay ( uint8_t ch )

private

◆ _setCol0Symbol()

void SegLCD_PCF85176_4DR821B::_setCol0Symbol ( uint8_t ch )

private

◆ _setColon()

void SegLCD_PCF85176_4DR821B::_setColon	(	uint8_t	row,
		uint8_t	col,
		bool	state
	)

overrideprivatevirtual

Virtual method for setting colon.

Default implementation is empty (no-op).

Reimplemented from SegLCDLib.

◆ _setDecimal()

void SegLCD_PCF85176_4DR821B::_setDecimal	(	uint8_t	row,
		uint8_t	col,
		bool	state
	)

overrideprivatevirtual

Virtual method for setting decimal point.

Each LCD has its own implementation with HW specifics. Default implementation is empty (no-op).

Reimplemented from SegLCDLib.

◆ init()

void SegLCD_PCF85176_4DR821B::init ( )

overridevirtual

Logical display sections that can be targeted by higher-level rendering logic.

Initialize the display driver, clear display and set position to 0,0.

Reimplemented from SegDriver_PCx85.

◆ setCursor()

void SegLCD_PCF85176_4DR821B::setCursor	(	uint8_t	row,
		uint8_t	col
	)

overridevirtual

Set cursor on exact digit.

Because LCD API is mainly used for character displays in this segment displays this function will be littlebit confusing. Because most of Segment LCD has only one row, thus this will be like row 0 and column will represent actual digit.

But if there is LCD like T1T2 LCD. Row 0 will be clock part, Row 1 will be T1: part and Row 2 will be T2: part of LCD

Parameters

row	Row, where 0-MAXROWS
col	Column 0-MAXDIGITS in current row

Reimplemented from SegLCDLib.

◆ setSymbol()

void SegLCD_PCF85176_4DR821B::setSymbol	(	uint8_t	symbol,
		bool	state
	)

◆ write()

size_t SegLCD_PCF85176_4DR821B::write ( uint8_t ch )

overridevirtual

Reimplemented from SegLCDLib.

Field Documentation

◆ ADDR_SEGS

constexpr uint8_t SegLCD_PCF85176_4DR821B::ADDR_SEGS = 0x01

staticconstexprprivate

◆ ADDR_SYMBOLS

constexpr uint8_t SegLCD_PCF85176_4DR821B::ADDR_SYMBOLS = 0x00

staticconstexprprivate

◆ DECIMAL_COL_OFFSET

constexpr int8_t SegLCD_PCF85176_4DR821B::DECIMAL_COL_OFFSET = -1

staticconstexprprivate

◆ DECIMAL_MAX_COL

constexpr uint8_t SegLCD_PCF85176_4DR821B::DECIMAL_MAX_COL = 2

staticconstexprprivate

◆ DECIMAL_MIN_COL

constexpr uint8_t SegLCD_PCF85176_4DR821B::DECIMAL_MIN_COL = 0

staticconstexprprivate

◆ DECIMAL_POINT_BIT

constexpr uint8_t SegLCD_PCF85176_4DR821B::DECIMAL_POINT_BIT = 0x01

staticconstexprprivate

◆ DIGITS

constexpr uint8_t SegLCD_PCF85176_4DR821B::DIGITS = 4

staticconstexprprivate

◆ FLAG_COL0_OVERLAY

constexpr uint8_t SegLCD_PCF85176_4DR821B::FLAG_COL0_OVERLAY = 0x02

staticconstexprprivate

◆ FLAG_COLON_DISPLAYED

constexpr uint8_t SegLCD_PCF85176_4DR821B::FLAG_COLON_DISPLAYED = 0x01

staticconstexprprivate

◆ LEFT_COLON_BIT

constexpr uint8_t SegLCD_PCF85176_4DR821B::LEFT_COLON_BIT = 0x20

staticconstexprprivate

◆ MIDDLE_COLON_BIT

constexpr uint8_t SegLCD_PCF85176_4DR821B::MIDDLE_COLON_BIT = 0x01

staticconstexprprivate

◆ MINUS_BIT

constexpr uint8_t SegLCD_PCF85176_4DR821B::MINUS_BIT = 0x40

staticconstexprprivate

◆ RAM_SIZE

constexpr uint8_t SegLCD_PCF85176_4DR821B::RAM_SIZE = 5

staticconstexprprivate

The documentation for this class was generated from the following files:

src/SegLCD_PCF85176_4DR821B.h
src/SegLCD_PCF85176_4DR821B.cpp

Public Types

Public Member Functions

Private Member Functions

Static Private Attributes

Additional Inherited Members

Detailed Description

Member Enumeration Documentation

◆ SymbolFlags

Constructor & Destructor Documentation

◆ SegLCD_PCF85176_4DR821B()

Member Function Documentation

◆ _handleCol0Overlay()

◆ _setCol0Symbol()

◆ _setColon()

◆ _setDecimal()

◆ init()

◆ setCursor()

◆ setSymbol()

◆ write()

Field Documentation

◆ ADDR_SEGS

◆ ADDR_SYMBOLS

◆ DECIMAL_COL_OFFSET

◆ DECIMAL_MAX_COL

◆ DECIMAL_MIN_COL

◆ DECIMAL_POINT_BIT

◆ DIGITS

◆ FLAG_COL0_OVERLAY

◆ FLAG_COLON_DISPLAYED

◆ LEFT_COLON_BIT

◆ MIDDLE_COLON_BIT

◆ MINUS_BIT

◆ RAM_SIZE